Details on the official website

The foods listed below are believed most likely to trigger arthritis inflammation and should be avoided during the first three weeks of an elimination diet.

Gluten, including all wheat products, such as breads and pastas
How Gluten Can Cause Joint Pain

Dairy products, such as milk, yogurt, cheese, and sour cream
Soy, including edamame, tofu, tempeh, miso, tamari, and many meat substitute products
Corn, including corn chips, tortillas, grits, and corn derivatives, such as corn syrups and starches
Eggs, including dishes that contain eggs, such as baked goods, breaded and fried foods, creams, and puddings
Nightshade vegetables, including tomatoes, potatoes, eggplant and peppers
Processed foods, especially processed baked goods, such as cookies, cakes, and bagels